Parallel running with cucumber-protractor

How can I run my tests in parallel mode using protractor-cucumber?

I am using examples from http://ift.tt/1tNNzE0 with second features/homepage_copy.feature.

Version of apps:

• node 5.4.1
• cucumber 0.10.2
• protractor 3.3.2
• protractor-cucumber 0.1.8

As the docs states this framework plugin gives a list of properties/methods exposed on the world object. So I need to do it in file features/step_definitions/steps.js

var pc = require('protractor-cucumber');

var steps = function() {
  var seleniumAddress = 'http://localhost:4444/wd/hub';
  var options = { browser : 'chrome', timeout : 100000 };
  this.World = pc.world(seleniumAddress, options);

  this.After(function(scenario, callback) {
    this.quit(callback);
  });
};

module.exports = steps;

Try like this one below doesn't work. There was no error, part of the code was ignored by the compiler.

var steps = function() {
  var seleniumAddress = 'http://localhost:4444/wd/hub';
  var options = { browser : 'chrome', timeout : 100000, 
                  desiredCapabilities: {maxInstances: 2} };
  this.World = pc.world(seleniumAddress, options);

My problem is how to use all of these methods delivered with this plugin? For example how to declare protractor for using the protractor lib?

Is there a way to use this plugin with conf.js file? If the way exists my problem would be solved.

exports.config = {
  // set to "custom" instead of cucumber.
  framework: 'custom',

  // path relative to the current config file
  frameworkPath: 'protractor-cucumber'

 // other properties omitted
};